Scraping device



Feb. 18,' 1941'. `T. E', CHERRY 2,232,367

' SCRAPING DEVICE Filed Nov. 16, 193e sheets-sheet 1 Feb. 18, 1941. `T.E. CHERRY 2,232,367

' SCRAPING DEVICE w Filed Nov. 16, 193e 2 sheets-sheet 2 if', a @545i17A,

3 4l' Ja -f .if i 1F40" 1 lill/III',

Patented Feb. 18, 1941 UNITED STATES PATENT OFFICE c claims.

This invention relates to .power-actuated scraping or cutting devicessuitable for removing p-aper, paint and other coating materials from awall, ceiling or like surface.

' rIlhe principal objects of the invention are to provide a scraper orcutting device lwhich is of strong and durable construction and reliableand efficient in operation, to provide a scraper which is so constructedand designed that particles relO moved from a wall or other ysurfacecannot penetrate into the Vicinity of the actuating mechanism, and toprovide a scraper in which friction with consequent deterioration ofparts and overy, heatingis reduced .to a minimum.

" IFurther objects will be apparent from a consideration of thefollowing description and the accompanying drawings, wherein:

Fig. 1 is a side elevation, on a reduced scale, of a scraper constructedin accordance with the present invention and illustrating a manner ofusing the same;

Fig. 2 is a top plan View, with parts broken away and shown in section,of the device shown in Fig. 1;

Fig. 3 is a section on the line 3-3 of Fig. 2;

Fig. 4 is a bottom plan View of the fronty end of the device;

Fig. 5 is a view, similar to Fig. 1, but illustrating a modifiedembodiment of the invention;

Fig. 6 is a top plan view, with parts broken away and shown in section,of the embodiment shown in Fig. 5;

Fig. '7 is an enlarged section on the line 'I-'I of Fig. 6; and

A Fig. 8 is an enlarged section on the line 8-8 of Fig. 7.

'Ihe embodiment shown in Figs. 1 to 4 comprises an elongate casting Ihaving at its outer end a flattened and widened nosepiece, desig- `natedby the numeral 2, the inner end of the casting being enlarged to providea section of a generally cylindrical housing 3 for an electric motor(not shown); The intermediate portion Hof the casting I isformed with anopen pocket -or recess 4 and a chamber 5 separated from the pocket 4 byan intervening wall portion 6, as shown in Fig. 3.

The nosepiece 2 is formed with a pair of spaced rectangular openings 'I(Fi-g. e1.)l and the marl V'ginal portions surrounding .these openingsprovide a supporting frame for a reciprocating scraper blade I0. Theupper face of the nosepiece is provided with a rectangular frame or re-'tainer member II (Figs. 2 and 3') formed along its side edges withspacers effective to hold itsfront (c1. so-ziz) and rear parts in spacedrelation to those of the nosepiece, thereby providing lateral guides for`the scraper blade I0. The front of the frame member I I is providedwith a curved guard piece I2 which extends outwardly with its end termi-5" nating closely adjacent to the outer edge of the scraper blade I0,the purpose being to provide a shield effective to deect scrapin-gsfalling upon the nose'piece 2 when the machine is operated. The centralpart |5 (Fig. 4) of the nosepiece 10 is formed with a longitudinallyextending groove I6 (Fig. 3) in alignment with an opening I'I formed inthe wall |8 of a ,pocket 4 and an opening I9 formed in the wall 6. Thescraper blade I0 has a snug sliding lit between the upper face l5;

of the nosepiece and `the retaining member and is rivetedv or otherwiserigidly secured to the attened outer end of an actuating arm 2|. Theouter end of the arm 2| ts within the groove V I5 and its inner portionextends rearwardly 20 through the opening I'I, the recess 4 and theopening I9, its inner end terminating within the chamber 5, as shown inFig. 3.

A coil compression spring 22 is circumposed about that portion of thearm 2| within the 25 pocket 4 and one end of this spring acts againstthe wall I8 and its opposite end engages a collar 24 .pinned orotherwise secured .to the arm 2|. The spring 22 is at all times undersuflicient ccmpression to urge the arm 2| inwardly in operative 3Urelation to the actuating mechanism presently to be described. v

The actuating mechanismv comprises a generally triangular-shaped cam 25secured to one face of a worm .gear 26 which is rotatably mount- 35 edon a shaft 21 having threaded ends, one of which extends through anopening in the side wall of the chamber 5 an-d its other end extend-`.ing through an opening in a disk-like closure 28 (Fig. 2) whichtightly fits about the opening to 4o the chamber 5, the shaft 21 andclosure 28 being held in position by the nuts 29, as shown in Fig. 2.The gear 26 is driven by a worm 3|) fixed to a drive shaft 3| which issuitably journaled in openings formed in the opposite walls of the 45chamber 5, the inner end of the drive shaft extending into the interiorof the housing 3 and being connected to the electric motor therein. Theparts are preferably so constructed and arranged that the inner end ofthe arm 2| is at 50 all times held in operative engagement with the cam25 so that rotation of the gear and cam eiects reciprocation of the armand scraper. The chamber 5 and its closure 23 are designed to hold asuitable lubricant, such as grease or 55 heavy oil, which not onlyensures adequate lubrication of the parts, but also serves to effect anecient dissipation of heat generated during the operation of the device.If desired, the stroke or magnitude of the reciprocating movement of thearm and scraper blade may be varied by adjusting the position of thecollar 24 relative to the wall 6 so that the collar serves as a stop tolimit the inward movemen-t of the ar-m.

The housing 3 for the electric motor comprises a pai-r of generallycylindrical sections, one of which, as above pointed out, is integralwith the casting and the other section carries a handle member 35 bymeans of which the device may be manipulated. The handle 35 is alsoprovided with an electric switch 36 (Fig. 2) conveniently located forready operation.

It will be noted that the construction of the device above described issuch that scrapings, particularly small particles, cannot possi-bly worktheir way from the nosepiece into the interior of the chamber 5 whichhouses the actuating mechanism, since the only possible access to thischamber is through the opening I9, but in view of t-he fact thatparticles necessarily would have to pass through the open pocket 4 toreach this point, it will be seen that the movement of the arm 2| iseffective to prevent accumulation of particles within the pocket 4, aswell as working their way along the inner end of the arm 2|.

The embodiment shown in Figs. 5 to 8 is similar in principle to thatpreviously described and comprises an elongate tubular body member 4|formed at one end with a ange 43, its opposite end having a threadedengagement with a casting 45. The casting 45 is formed with a chamber 48at one end and its opposite end terminates in a attened and widenednosepiece 50 provided with a retainer member 5| (Fig. 7) which may be ofa construction similar to that of the previously described embodiment.The nosepiece 50 and retainer 5| support a scraper blade forreciprocating' ,movement and the inner end of the scaper blade isrigidly secured to an actuating arm 56 slidably mounted in an opening 51which communicates with the chamber 48.

The inner end of the arm 56 is associated with an actuating mechanismcomprising a yoke member 6!) having at diametrically opposite pointsoutwardly projecting arms 6I and 62. The arm 6| is slidably supported inthe opening 51 and is connected with the inner end of the arm 56, andthe arm- 62 is slidably supported in a bushing 64 mounted in an openingin the rear wall of the chamber 48. The body of the yoke extends about agenerally triangular cam 65 which is secured toone face of a worm gear66 rotatably mounted on a shaft 61 whose opposite ends are anchored inopenings formed in the side wall 68 and a closure 10 for the chamber 48.The yoke 60 is formed with inwardly projecting bosses 1| and 12engageable with the periphery of the cam so that rotation of the lattereffects reciprocation of the yoke and associated parts. The gear 66 isdriven bly a worm 15 fixed to a drive shaft 16 which is journaled inopenings in opposite walls of the chamber 48, as shown in Fig. 7. Thechamber 48 is designed to hold a suitable lubricant and to this end thearm 56 accurately rits the opening 51 so as to prevent leakage. In orderto provide for the discharge of scrapings tending to work their waytoward the actuating mechanism, the outer end of the opening 51 extendsto the rear edge of the retainer member 5|, thus providing a dischargeport 18, as shown in Fig. '1.

The drive shaft 16 extends through the body 4| and is connected in anysuitable manner with an electric motor 80 which is rigidly secured tothe flange 43. A handle 8| is attached to the casing of the motor 80 anda control switch (not shown) may be provided for convenient operation.

While I have shown and described different desirable embodiments of theinvention, it is to be understood that the disclosure is for the purposeof illustration and that various changes in shape, proportion, andarrangement of parts, as well as the substitution of equivalent elementsfor those herein shown and described, may be made without departing fromthe spirit and scope of the invention as set forth in the appendedclaims.

I claim:

1. A scraping device of the class described, comprising a member formedat one end with a substantially enclosed chamber for holding a lubricantand at its opposite end with a substantially iiat nosepiece and adischarge port between the chamber and nosepiece, a scraper blademounted on said nosepiece for reciprocating movement, said scraper bladehaving an actuating member extending by said discharge port and into theinterior of said chamber, actuating mechanism Within said chamberoperatively associated with said actuating member so as to effect areciprocation of said scraper blade.

2. A scraper device of the class described, comprising an elongatemember having adjacent to one-end a substantially leakproof chamber forholding a lubricant and at its intermediate portion a pocket separatedfrom said chamber by a wall having a discharge opening therein, theother end of said member terminating in a substantially at nosepiece, ascraper blade mounted on said nosepiece for reciprocating movement, saidscraper blade having an actuating member extending through said pocketand into the interior of said chamber, actuating mechanism within saidchamber operatively associated With said actuating member so as toeffect reciprocation. of said scraper blade.

3. A scraper device of the class described, comprising an elongatemember having adjacent to one end a substantially leakproof chamber forholding a lubricant and `at its intermediate portion a pocket separatedfrom said chamber by a wall having a discharge opening therein, theother end of said member terminating in a substantially flat nosepiece,a scraper blade mounted on said nosepiece for reciprocating movement,said scraper blade having an actuating member extending through saidpocket and into the interior of said chamber, actuating mechanism withinsaid chamber and pocket, said mechanism comprising a worm` and gear, acam secured to one face of the gear, and spring means l a recess and atits opposite end an enclosed substantially leakproof chamber for holdinga lubricant, a scraper blade mounted in said guiding means forreciprocating movement, reciprocating mechanism within the chamber, andmeans connecting said mechanism and scraper blade so as to effect thereciprocation of the latter.

5. A scraper device comprising an elongate casting formed at one endwith a flattened nosepiece having discharge openings in combination withan upper plate having like discharge openings and dening with saidnosepiece guiding means extending inwardly from its outer edge, saidcasting having at its intermediate portion a recess providing a furthermeans of discharging waste material and at its opposite end asubstantially leakproof chamber for holding a lubricant, a reciprocatingmechanism within the chamber, a scraper blade mounted in said guidingmeans for reciprocating movement, and connection between said mechanismand scraper blade operative to eiect the reciprocation of the latter.

6. A scraper device of the class described, comprising an elongatecasting formed at one end with a flattened nosepiece having dischargeopenings in combination with an upper plate having similarly formeddischarge openings, said nosepiece and plate defining lateral guides eX-tending inwardly toward the casting body, said casting body having anintermediate recess and a substantially enclosed chamber at the endremote from said nosepiece, a scraper blade mounted in said guides forreciprocating movement, and actuating mechanism disposed within saidchamber comprising a worm and gear, a triangular cam secured to one faceof the gear, and an actuating arm extending from said chamber throughsaid recess, the outer end of said arm being connected with said scraperblade and its inner end being operatively associated with said cam, andspring means disposed within said recess and acting on said arm to urgeit inwardly.

THOMAS E. CHERRY.

